Has the crash log from my most recent crash been investigated? As noted, it was not an iPhone crash, it was a MediaMonkey AV in iPhoneCalc.dll.

Disabling the control centre has not been effective for me.

Given that this is a Heisenberg which occurs randomly, it's possible that people are grasping at straws and when they have a single successful run, attributing that random occurrence to whatever they happened to change last.

I've had the same issue as Outlandis since the iPhone 4s. I went to using d_itunes4.dll for a few years since the issue could never be resolved. Back when I tested this I tried syncing on multiple PCS, restoring the phone in between all the same result. As of now I have an entire new PC build with 32 GB of Ram. Definitely more than enough to handle a large sync. Using the iPhone 6 Plus it still fails, no matter what. Starts off a good speed then slowly crawls to a halt. It will sync with my iPods, but any iPhone I have it does the same thing. I even simplified my playlists to basically ratings, that's all. Still crashes. Wish this could get resolved because I still use MediaMonkey I just have to struggle every sync.

Just wanted to add one more test. I installed the new beta, restored and did the Reset All Settings fix. The Reset All Settings fix seemed to speed it up considerably. The sync completed but then when I check my device, less than 10% of the songs made it. For example one of my playlist has over 1000 songs, on the device it only shows 3.

@msherman: I have done some optimizations in the course of fixing the issue http://www.ventismedia.com/mantis/view.php?id=12806
So now (if any of the workarounds does not work for you and iPhone will reboot unexpectedly) the content seen by MM and by the phone should be the same and initiating auto-sync in MM should continue and complete the previously interrupted sync.

@sdudley7: I remember you, we have been solving a long ticket (FWO-922826) two years ago. Your last but one reply was "got it fixed" by setting up as a new iPhone and then restoring your backup, but 5 days later you indicated that the issue is back.
Could you attach a new debug log to the ticket? Maybe I will see there something different. BTW: Are you also seeing the unexpected reboot problem or simply an incomplete/slow sync without a reboot?

Ludek, that issue was about Outlandis' problem with songs not matching their metadata on the iPhone. I never experienced that problem, probably because I always ended up manually deleting the "phantom content" from the phone using iFunBox once it got into that state, to avoid losing the space forever.

The problem I'm asking about is the MediaMonkey AV crash in iPhoneCalc.dll that I reported a couple weeks ago. That's an AV in MM code, so it's clearly a bug that needs to be fixed on your end, not something that Apple's causing. I haven't seen any ack of that with a bug number yet. Have you investigated the crash dump I uploaded after the crash?

@msherman
The AV crash in iPhoneCalc.dll was most probably caused by an unexpected BPLIST data sent by the device, but to show which data it was I needed to expand debug messaging in iPhoneCalc.dll, I attached it to the ticket BJS-458-67430 with instructions, so please continue via the ticket. Thx.

I'm gonna be honest, Ludek, that's not going to happen any time soon. I've finally got my entire music collection on my phone (by using the iTunes plugin), and I'm not inclined to start this process over. Please have your QA group follow up to replicate this issue and collect the details you need to fix it.